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We are experts at inspecting & finding things that people would ordinarily ignore or miss. That is the nature of what we do. In this particular case just about anyone would be able to see what is going on. Burrows in the snow are a pretty obvious sign of a pest issue. The burrows you are looking at are rat burrows. They are fresh & active as you can see the tracks & paw prints in the snow as well as the mud staining around the burrow entrance.
Rats can easily burrow through frozen soil & freezing cold snow with no problem at all. Rats are experts at adapting to the conditions in their environment. Typically rat burrows are well hidden because they do not want to be seen by predators but when it is winter they have no choice. It certainly makes exterior inspections easier for me!